Acquisitions (Details) (USD $)	3 Months Ended								6 Months Ended	12 Months Ended								0 Months Ended	1 Months Ended	12 Months Ended				1 Months Ended			1 Months Ended				1 Months Ended			1 Months Ended			1 Months Ended			1 Months Ended				12 Months Ended				0 Months Ended	1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 INFORMATION TECHNOLOGY Minimum	Mar. 31, 2012 INFORMATION TECHNOLOGY Minimum	Mar. 31, 2013 INFORMATION TECHNOLOGY Maximum	Mar. 31, 2012 INFORMATION TECHNOLOGY Maximum	Mar. 31, 2013 Common units	Mar. 31, 2012 Common units	Jun. 19, 2012 General partner	Jun. 30, 2012 General partner Common units	Mar. 31, 2013 High Sierra	Jun. 19, 2012 High Sierra	Jun. 19, 2012 High Sierra Trade names	Jun. 19, 2012 High Sierra Customer relationships	Jun. 30, 2012 High Sierra Customer relationships Minimum	Jun. 30, 2012 High Sierra Customer relationships Maximum	Jun. 19, 2012 High Sierra Lease contracts	Jun. 30, 2012 High Sierra Lease contracts Minimum	Jun. 30, 2012 High Sierra Lease contracts Maximum	Jun. 19, 2012 High Sierra Land	Jun. 19, 2012 High Sierra Transportation vehicles and equipment	Jun. 30, 2012 High Sierra Transportation vehicles and equipment Minimum	Jun. 30, 2012 High Sierra Transportation vehicles and equipment Maximum	Jun. 19, 2012 High Sierra Facilities and equipment	Jun. 30, 2012 High Sierra Facilities and equipment Minimum	Jun. 30, 2012 High Sierra Facilities and equipment Maximum	Jun. 19, 2012 High Sierra Buildings and improvements	Jun. 30, 2012 High Sierra Buildings and improvements Minimum	Jun. 30, 2012 High Sierra Buildings and improvements Maximum	Jun. 19, 2012 High Sierra EQUIPMENT AND SOFTWARE	Jun. 30, 2012 High Sierra EQUIPMENT AND SOFTWARE Minimum	Jun. 30, 2012 High Sierra EQUIPMENT AND SOFTWARE Maximum	Jun. 30, 2012 High Sierra INFORMATION TECHNOLOGY	Jun. 19, 2012 High Sierra Construction in progress	Mar. 31, 2013 High Sierra Crude oil logistics	Mar. 31, 2013 High Sierra Natural gas liquids logistics	Mar. 31, 2013 High Sierra Water services	Mar. 31, 2013 High Sierra Other	Jun. 19, 2012 High Sierra Energy, LP	Jun. 30, 2012 High Sierra Energy, LP Common units	Jun. 19, 2012 High Sierra Energy, LP Common units	Jun. 19, 2012 High Sierra Energy, LP General partner	Jun. 19, 2012 High Sierra Energy GP, LLC General partner
Acquisitions
Cash paid to acquire ownership interests, net of cash acquired									$ 17,400,000	$ 490,402,000	$ 297,401,000
Cash acquired																																																5,000,000
Number of common units issued to acquire ownership interests (in shares)																24,250,258	14,432,031																																18,018,468
Value of common units issued using the closing price of units on the New York Stock Exchange on the merger date																																																		406,800,000
Amount of additional consideration payable	5,000,000									5,000,000																																						97,400,000
Cash paid to acquire ownership interests	14,000,000									14,000,000										239,251																												91,800,000			50,000,000	50,000,000
Amount paid																		50,000,000
Common units issued																		2,685,042	2,685,042																													18,018,468
Value of common units issued																			8,000,000
Fair value of common units issued																			60,600,000
General and administrative expense																				3,700,000
Equity issuance costs																				600,000
Operating income									14,837,000	87,307,000	15,030,000									46,600,000
Revenues	1,617,613,000	1,338,208,000	1,135,510,000	326,436,000	438,938,000	470,649,000	210,041,000	190,845,000	622,232,000	4,417,767,000	1,310,473,000									3,079,172,000																								2,316,288,000	696,424,000	62,227,000	4,233,000
Cost of sales	1,481,890,000	1,204,545,000	1,053,690,000	298,985,000	389,806,000	439,790,000	201,454,000	185,973,000	583,032,000	4,039,110,000	1,217,023,000									2,913,888,000																								2,244,647,000	663,630,000	5,611,000
Estimated fair value of the assets acquired and liabilities assumed
Accounts receivable																					395,311,000
Inventory																					43,575,000
Receivables from affiliates																					7,724,000
Derivative assets																					10,646,000
Forward purchase and sale contracts																					34,717,000
Other current assets																					11,131,000
Property, plant and equipment																													5,910,000	20,968,000			103,574,000			9,691,000			4,099,000				11,213,000
Useful life of property, plant and equipment												3 years	3 years	5 years	5 years																5 years	10 years		2 years	30 years		5 years	30 years		3 years	5 years	5 years
Intangible assets																						13,000,000	245,000,000			12,400,000
Useful life of intangible assets																								5 years	17 years		1 year	10 years
Goodwill																					220,884,000
Assumed liabilities:
Accounts payable																					(417,369,000)
Accrued expenses and other current liabilities																					(35,611,000)
Payables to affiliates																					(9,014,000)
Advance payments received from customers																					(1,237,000)
Derivative liabilities																					(5,726,000)
Forward purchase and sale contracts																					(18,680,000)
Long-term debt																					(2,537,000)
Other noncurrent liabilities																					(3,224,000)
Noncontrolling interest in consolidated subsidiary																					(2,400,000)
Consideration paid, net of cash acquired																					654,045,000
Estimated uncollectable accounts for fair value of accounts receivable																				$ 600,000